High pressure means low tides

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HIGH barometric or air pressure across New Zealand has significantly affected tidal levels here, with lower than usual tides particularly obvious in Poverty Bay.

The tides have been noticeably lower than usual and in some places rocks have been exposed that have not been seen for some years.

The lower tides have also affected loading operations at Eastland Port.

“High barometric pressure tends to hold the tides down and in Poverty Bay recently the tides have been 20 to 30 centimetres lower than usual,” said Eastland Port marine manager Chris Kaye.

“We have not been able to load the quantity of cargo we wanted on to some ships because they had less water underneath them at low tide.

“The higher pressure effects other places around New Zealand in different ways, but here in Poverty Bay the effect can be significant and has been.”

Mr Kaye said the barometric pressure was having a more noticeable impact on tides than the effect of the full moon.

“The reverse tidal situation applies when we have low barometic pressure. The tides are higher.”

HIGH barometric or air pressure across New Zealand has significantly affected tidal levels here, with lower than usual tides particularly obvious in Poverty Bay.

The tides have been noticeably lower than usual and in some places rocks have been exposed that have not been seen for some years.

The lower tides have also affected loading operations at Eastland Port.

“High barometric pressure tends to hold the tides down and in Poverty Bay recently the tides have been 20 to 30 centimetres lower than usual,” said Eastland Port marine manager Chris Kaye.

“We have not been able to load the quantity of cargo we wanted on to some ships because they had less water underneath them at low tide.

“The higher pressure effects other places around New Zealand in different ways, but here in Poverty Bay the effect can be significant and has been.”

Mr Kaye said the barometric pressure was having a more noticeable impact on tides than the effect of the full moon.

“The reverse tidal situation applies when we have low barometic pressure. The tides are higher.”

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